/*重置样式*/
html,body{
    width: 100%;
    height: 100%;
}
*{
    margin: 0;
    padding: 0;
}
a{  text-decoration: none;  }
li{  list-style: none;  }
.clear:after{
    content: "";clear: both;display: block;height: 0;overflow: hidden;visibility: hidden;
}
.wrap{
    margin: 0 auto;  width: 1200px;
}
